<template>
  <div class="app-container">
    <el-input v-model="filterText" placeholder="Filter keyword" style="margin-bottom:30px;" />

    <el-tree
      ref="tree2"
      :data="data2"
      :props="defaultProps"
      :filter-node-method="filterNode"
      class="filter-tree"
      default-expand-all
    />

  </div>
</template>

<script>
export default {

    data() {
        return {
            filterText: '',
            data2: [{
                id: 1,
                label: 'Level one 1',
                children: [{
                    id: 4,
                    label: 'Level two 1-1',
                    children: [{
                        id: 9,
                        label: 'Level three 1-1-1'
                    }, {
                        id: 10,
                        label: 'Level three 1-1-2'
                    }]
                }]
            }, {
                id: 2,
                label: 'Level one 2',
                children: [{
                    id: 5,
                    label: 'Level two 2-1'
                }, {
                    id: 6,
                    label: 'Level two 2-2'
                }]
            }, {
                id: 3,
                label: 'Level one 3',
                children: [{
                    id: 7,
                    label: 'Level two 3-1'
                }, {
                    id: 8,
                    label: 'Level two 3-2'
                }]
            }],
            defaultProps: {
                children: 'children',
                label: 'label'
            }
        }
    },
    watch: {
        filterText(val) {
            this.$refs.tree2.filter(val)
        }
    },

    methods: {
        filterNode(value, data) {
            if (!value) return true
            return data.label.indexOf(value) !== -1
        }
    }
}
</script>

